Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 BMW 320i Automatic TransFACTORY OEM SERVICE PROCEDURE
Engine Electrical System - Repair - F30
- Troubleshooting
- 61 20... Battery replacement information
- 61 13... Butt connector for repairing a plug connection
- 12 00 Contents of Engine Electrical System General
- 11 00... Handling components after flood damage
- 12 00... Instructions for removal and replacement of control units
- 12 00... Instructions for working on the ignition system
- 61 00... Notes for disconnecting and connecting battery
- 61 13... Notes for opening contacts and locks of different plug contact systems
- 61 00... Notes on handling wiring harnesses and cables
- 12 00... Notes/information on start assistance (jump starting)
- 12 00... Removing and installing/replacing the ignition coil cover (N55 Hybrid)
- 00 Safety information for working on vehicles with automatic engine start-stop function (MSA)
- 61 00... Safety information on handling hybrid cars
- 61 13... Unlocking and disconnecting various plug connections in hybrid vehicles
- Ignition Wires, Spark Plugs
- Ignition Coil
- Electronic Switching Or Control Units
- 12 14 700 Coding control module (DME/DDE)
- 12 14 705 Programming control unit (DME/DDE)
- 12 14 602 Removing/replacing knock sensor (1st and 2nd cylinder) (N20, N26)
- 12 14 600 Removing/replacing knock sensor (3rd and 4th cylinder) (N20, N26)
- 12 14 600 Removing/replacing knock sensors (N55 Hybrid)
- 12 14 600 Removing/replacing knock sensors (N55)
- 12 14 524 Replace pulse sensor on exhaust camshaft (N20, N26)
- 13 61 501 Replacing control unit (DDE) (N47 D20 O 1 with SCR)
- 12 14 550 Replacing control unit (DME) (N20, N26)
- 12 14 550 Replacing control unit (DME) (N55)
- 12 14 550 Replacing control unit (DME) (N55 Hybrid)
- 12 14 550 Replacing control unit box (N47 D20 O 1 with SCR)
- 12 14 521 Replacing crankshaft pulse sensor (N20, N26)
- 12 14 521 Replacing crankshaft pulse sensor (N55)
- 12 14 521 Replacing crankshaft pulse sensor (N55 hybrid)
- 12 14 550 Replacing electronics box (N47 D16/20 K/U/O/T 1)
- 12 14 650 Replacing intake plenum (N55 Hybrid)
- 12 63 586 Replacing power distribution module (N20, N26, N55)
- 12 63 586 Replacing power distribution module (N55 Hybrid)
- 12 14 651 Replacing pressure sensor on charge air duct (N55)
- 12 14 650 Replacing pressure sensor on intake plenum (N55)
- 12 14 524 Replacing pulse sensor on exhaust camshaft (N55 Hybrid)
- 12 14 524 Replacing pulse sensor on exhaust camshaft (N55)
- 12 14 523 Replacing pulse sensor on intake camshaft (N20, N26)
- 12 14 523 Replacing pulse sensor on intake camshaft (N55)
- 12 14 650 Replacing suction pressure sensor on intake plenum (N20, N26)
- 12 14 650 Replacing suction pressure sensor on pressure pipe (N20, N26)
- 12 14 523 Replacing the pulse sensor on the intake camshaft (N55 Hybrid)
- Preheating Relay
- PREHEATER Plugs
- Alternator With Drive And Mounting
- 12 31 020 Removing and installing or replacing alternator (N20, N26)
- 12 31 020 Removing and installing or replacing alternator (N55)
- 12 31 022 Removing and installing or replacing starter motor generator (N55 Hybrid)
- 12 31 020 Removing and installing/replacing alternator (N47 D16/20 K/U/O/T 1)
- 12 31 020 Removing and refitting/replacing alternator (N47 D20 O 1 with SCR)
- Controller
- Electrical Machines
- Control Units, Electric Machines
- Starter With Mounting
- 11 00... Handling components after flood damage
- 12 41 020 Removing and installing/replacing starter motor (N20, N26)
- 12 41 020 Removing and installing/replacing starter motor (N47 D16/20 K/U/O/T 1)
- 12 41 020 Removing and installing/replacing starter motor (N55)
- 12 41 020 Removing and installing/replacing the starter motor (N55 Hybrid)
- 12 41 020 Removing and refitting/replacing starter motor (N47 D20 O 1 with SCR)
- 12 41 041 Replacing solenoid switch Turn off ignition Remove starter motor
- Starter Lead
- 12 42 500 Replacing positive battery cable between starter motor, alternator and positive battery connection point (N55)
- 12 42 540 Replacing safety battery terminal (SBK)
- 12 42 500 Replacing the battery positive lead between the starter and battery positive connection point (N55 hybrid)
- 12 42 500 Replacing the positive battery cable between the starter motor, alternator and positive battery connection point (N20, N26)
- 12 42 500 Replacing the positive battery cable between the starter motor, alternator and positive battery connection point (N47 D16/20 K/U/O/T 1)
- 12 42 500 Replacing the positive battery lead between the starter motor, alternator and battery positive connection point (N47 D20 O 1 with SCR)
- Engine Wiring Loom
- 12 51 235 Removing and installing/replacing engine sensor system wiring harness module 1 (N20, N26)
- 12 51 240 Removing and installing/replacing engine wiring harness sensor system module 2 (N20, N26)
- 12 51 215 Replacing wiring harness section for Valvetronic servomotor (N20, N26)
- 12 51 001 Replacing wiring harness section for engine (N47 D16/20 K/U/O/T 1)
- 12 51 001 Replacing wiring harness section for engine (N55 Hybrid)
- 12 51 001 Replacing wiring harness section for engine (N55)
- 12 51 245 Replacing wiring harness section for engine transmission module (N20, N26)
- 12 51 210 Replacing wiring harness section for ignition and injectors (N20, N26)
- 12 51 100 Replacing wiring harness section for ignition and injectors (N55)
- 12 51 100 Replacing wiring harness section for ignition and injectors (N55 Hybrid)
- 12 51 200 Replacing wiring harness section for injectors (N47 D16/20 K/U/O/T 1)
- 12 51 001 Replacing wiring loom section for engine (N47 D20 O 1 with SCR)
- 12 51 200 Replacing wiring loom section for injectors (N47 D20 O 1 with SCR)
- 61 00... Safety information on handling hybrid cars
- Oil Pressure/Oil Temperature/Oil Gauge
- 12 61 285 Removing and installing/renewing oil level sensor for engine oil (N55)
- 12 61 588 Removing and installing/replacing engine oil pressure/temperature sensor (N20, N26)
- 12 61 285 Removing and installing/replacing oil level sensor for engine oil (N20, N26)
- 12 61 285 Removing and installing/replacing oil level sensor for engine oil (N55 hybrid)
- 12 61 280 Removing and installing/replacing oil pressure sensor (N55)
- 12 61 280 Removing and installing/replacing oil pressure sensor (N55 Hybrid)
- 12 61 280 Removing and installing/replacing oil pressure switch (N47 D16/20 K/U/O/T 1)
- 12 61 285 Removing and installing/replacing the oil-level sensor for engine oil (N47 D16/20 K/U/O/T 1)
- 12 61 285 Removing and refitting/replacing engine oil level sensor (N47 D20 O 1 with SCR)
- 12 61 280 Removing and refitting/replacing oil pressure switch (N47 D20 O 1 with SCR)
- Switches And Relays
- Control Unit Box
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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